Mouse susceptibility to infection by the Salmonella abortusovis vaccine strain Rv6 is controlled by the Ity/Nramp 1 gene and influences the antibody but not the complement responses.
Early growth of Salmonella typhimurium in spleen and liver of mice is controlled by the mouse chromosome 1 locus Ity/Nramp 1. Genetic control of resistance to the attenuated vaccine strain Rv6 of Salmonella abortusovis was studied in mice infected by the intravenous route. Comparison of kinetics of bacterial colonization of spleen and liver in two congenic BALB/c-susceptible (Itys) and -resistant (Ityr) mouse lines showed that BALB/c mice (Itys) were significantly more susceptible to infection than C.D2 mice (Ityr) suggesting that infection by this vaccine strain is controlled by a gene which is close or identical to Ity/Nramp 1. Congenic mice also differed in their anti-Salmonella antibody response, measured by ELISA: susceptible mice had a significantly higher antibody level than resistant mice, whatever the immunoglobulin isotype (IgM, IgG1, IgG2a, IgG3, IgA, and total immunoglobulins). The two congenic BALB/c mouse lines had equal serum C3c levels in response to infection. However, we observed a highly significant difference according to the sex of mice, suggesting a role of sex hormones in the regulation of the level of some complement factors. These results, obtained with congenic mice, strongly suggest that the Ity/Nramp 1 locus controls susceptibility to infection by the S. abortusovis vaccine strain Rv6 and influences the antibody response.
Gautier
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AV
Laboratoire de Pathologie Infectieuse et d>>Immunologie, INRA Centre de Tours, Nouzilly, 37380, France.
Lantier
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I
Lantier
F
F
D000818:Animals; D000907:Antibodies, Bacterial / Q000096:biosynthesis; D001428:Bacterial Vaccines / Q000276:immunology; D002352:Carrier Proteins / Q000235:genetics*; D027682:Cation Transport Proteins; D015932:Complement C3c / Q000378:metabolism; D005260:Female; D007132:Immunoglobulin Isotypes / Q000096:biosynthesis; D007700:Kinetics; D008297:Male; D008565:Membrane Proteins / Q000235:genetics*; D051379:Mice; D008807:Mice, Inbred BALB C; D012475:Salmonella / Q000276:immunology* / Q000472:pathogenicity*; D012481:Salmonella Infections, Animal / Q000209:etiology / Q000235:genetics* / Q000276:immunology*; D012727:Sex Characteristics; D014774:Virulence / Q000276:immunology; D000099173:Natural Resistance-associated Macrophage Protein 1
D000907:Antibodies, Bacterial; D001428:Bacterial Vaccines; D002352:Carrier Proteins; D027682:Cation Transport Proteins; D015932:Complement C3c; D007132:Immunoglobulin Isotypes; D008565:Membrane Proteins; D000099173:Natural Resistance-associated Macrophage Protein 1